Unit 6 Review

A cheetah and a paramecium, like the ones shown, are both living things. According to the cell theory, what can you conclude about these two very different organisms?

• They are made of many cells.

• They are made of one or more cells.

• They come from the same kind of cell.

• They come from noncellular structures.

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A group of two or more atoms held together by chemical bonds is called

• an element.

• a unit.

• a lipid.

• a molecule.

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A tissue within a multicellular organism contains cells that

• no longer divide.

• perform a specific function.

• function independently from one another.

• do not grow.

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According to the cell theory, all cells come from

• animals.

• existing cells.

• nonliving matter.

• plants.

All of the following are molecules except:

• water

• DNA

• calcium

• carbon dioxide

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Cell theory has three parts: The cell is the basic unit of life in all living things, all cells come from existing cells, and _______________.

• nonliving things are composed of cells.

• the cell was discovered by Robert Hooke

• all organisms are made of one or more cells

• all cells are microscopic in size

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Cells may have different shapes and different amounts of organelles, depending on their function. Which features do plant cells have that animal cells lack?

• chloroplast, ribosome, and cell wall

• Golgi apparatus, cytoskeleton, and vesicle

• cell wall, chloroplast, and central vacuole

• central vacuole, chloroplast, and smooth ER

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Cells of all organisms are able to maintain internal stability despite changes in their environment. What is the name for this internal stability?

• osmosis

• responsiveness

• gradualism

• homeostasis

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How are cells with similar functions organized in multicellular organisms?

• into tissues

• into organs

• into systems

• into whole organisms

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How are plant cells unlike animal cells?

• Plant cells have cell membranes.

• Plant cells have mitochondria.

• Plant cells have vacuoles.

• Plant cells have cell walls.

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